This is the best image I've found of the engine. I've given it some mild enhancement. The damage pattern is... interesting. The fan looks substantially intact, or at least not completely disrupted - but the engine forward of the fan looks completely munted. It looks almost as if (note, as if,
not saying that actually happened!) it
hit something fairly substantial, but didn't ingest it.
Any thoughts on what could cause that damage? The other thing it looks kinda like is the 'explosive' damage you might expect from something like a compressor surge on steroids - you know the really loud BANG type with flames out the front of the engine; like that but something worse.
Interestingly, Southwest 438 back in 2007 was determined to be "...due to the No. 2 engine experiencing a release of its fan spinner through the fan cowl as a result of an unidentified object striking the spinner, separating it from the fan disk and causing the spinner to be ingested into the fan blades."
Damage in that incident: severe to fan, much less to cowling:
EDIT for clarification:
above is engine from Southwest 438 in 2007;
below is today's failure: